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Title: The Prologue Past.
Creator: McKee, Raymond, Bartkevicius, Jocelyn, Rushin, Pat, Roney, Lisa, University of Central Florida
Abstract / Description: The Prologue Past is a collection of four essays and one novella which explore the past in different fashions. Memory, and the ability to reflect and find meaning in our experiences, is an important cornerstone of engaging the past. Memories are a true anomaly of how our inner-consciousness operates. With each day, the past facilitates a special part of our memory bank which we seldom have any control of. While the abilities of people to recall times, events, places, and experiences differ...
Show moreThe Prologue Past is a collection of four essays and one novella which explore the past in different fashions. Memory, and the ability to reflect and find meaning in our experiences, is an important cornerstone of engaging the past. Memories are a true anomaly of how our inner-consciousness operates. With each day, the past facilitates a special part of our memory bank which we seldom have any control of. While the abilities of people to recall times, events, places, and experiences differ largely in capacity, we all undoubtedly share universal traits in the manner in which we hold onto our memories. I'm personally fascinated by the notion of unreliable memory or the inability to recall a past event in a concrete moment in time. I'm equally intrigued by what's tied to our most vivid recollections of the past, involving adrenaline and emotion. My exploration of memory(-)and how it's ascertained and utilized(-)is based on certain moments in my life presented in these personal stories, which range from childhood endeavors to adult conquests, seemingly linked together through particular themes of fear, loss, and hope.
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Date Issued: 2014
Identifier: CFE0005530, ucf:50306
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005530

Title: Phonological Working Memory Deficits in ADHD Revisited: The Role of Lower-Level Information Processing Deficits in Impaired Working Memory Performance.
Creator: Raiker, Joseph, Rapport, Mark, Beidel, Deborah, Mouloua, Mustapha, Vasquez, Eleazar, University of Central Florida
Abstract / Description: Working memory deficits in children with ADHD are well established; however, insufficient evidence exists concerning the degree to which lower-level cognitive processes contribute to these deficits. The current study dissociates lower level information processing abilities (i.e., visual registration, orthographic conversion, and response output) in children with ADHD and typically developing children and examines the unique contribution of these processes to their phonological working memory...
Show moreWorking memory deficits in children with ADHD are well established; however, insufficient evidence exists concerning the degree to which lower-level cognitive processes contribute to these deficits. The current study dissociates lower level information processing abilities (i.e., visual registration, orthographic conversion, and response output) in children with ADHD and typically developing children and examines the unique contribution of these processes to their phonological working memory performance. Thirty-four boys between 8 and 12 years of age (20 ADHD, 14 typically developing) were administered novel information processing and phonological working memory tasks. Between-group differences were examined and bootstrap mediation analysis was used to evaluate the mediating effect of information processing deficits on phonological working memory performance. Results revealed moderate to large magnitude deficits in visual registration and encoding, orthographic to phonological conversion, and phonological working memory in children with ADHD. Subsequent mediation analyses, however, revealed that visual registration/encoding alone mediated the diagnostic group status/phonological working memory relationship and accounted for approximately 32% of the variance in children's phonological working memory performance. Diagnostic and treatment implications for understanding the complex interplay among multiple cognitive deficits in children with ADHD are discussed.
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Date Issued: 2014
Identifier: CFE0005694, ucf:50141
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005694

Title: Building a Foundation for Goal-Attainment and Problem-Solving in Interdisciplinary Studies: Reimagining Web-Based Core Curriculum through a Classical Lens.
Creator: Jardaneh, Said, Fiore, Stephen, Sims, Valerie, McDaniel, Rudy, University of Central Florida
Abstract / Description: The core curriculum of interdisciplinary studies undergraduate programs represents interdisciplinarity as a consciously applied process, whether individually or collaboratively, of drawing and integrating insights from various disciplinary perspectives toward complex problem-solving and innovation. At the front-end of these programs students are often introduced to interdisciplinarity through terminology, metaphors, concepts, and context that are intended to familiarize them with the process....
Show moreThe core curriculum of interdisciplinary studies undergraduate programs represents interdisciplinarity as a consciously applied process, whether individually or collaboratively, of drawing and integrating insights from various disciplinary perspectives toward complex problem-solving and innovation. At the front-end of these programs students are often introduced to interdisciplinarity through terminology, metaphors, concepts, and context that are intended to familiarize them with the process. This initiation usually precedes what will ultimately entail a limited number of upper-division courses within the several disciplines or areas that will encompass a unique plan of study characterized by its breadth. The philosophy underlying current pedagogy in interdisciplinary studies appears in many ways to mirror the cognitive habitudes and socio-cultural zeitgeist that have emerged with our increasing connectedness with and reliance on digital technology.This dissertation proposes that through a revised front-end core curriculum revisiting both classical and Ramist pedagogy, and perhaps reframing how we think about interdisciplinarity itself, we need not sacrifice depth for breadth. Rather, we may be able to encourage a broadly applicable self-directed goal-centered mindset in our students that places equal emphasis on both breadth and depth in terms of deliberate knowledge acquisition. Through adapting the initial phases of a cognitivist instructional design model provisional week-by-week, curricular content is presented to illustrate how this endeavor might be realized within the context of interdisciplinary studies or like programs. This core curricular model is intended as an alternative well-suited to both the fully online and mixed mode format as well as the diversity of students within the typical undergraduate interdisciplinary studies program.
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Date Issued: 2016
Identifier: CFE0006120, ucf:51180
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006120

Title: 'The Tourist Soldier': Veterans Remember the American Occupation of Germany, 1950-1955.
Creator: Vance, Meghan, Lindsay, Anne, Lyons, Amelia, Beiler, Rosalind, University of Central Florida
Abstract / Description: Studies of postwar Germany, from 1945-1955, have concentrated on the American influence as a military occupier, the development of German reconstruction and national identity, and memory of this period from the German perspective. Within the memory analyses, firsthand accounts have been analyzed to understand the perspectives of Germans living through the postwar period. Absent from this historiography is an account of American memories and firsthand perspectives of the occupation,...
Show moreStudies of postwar Germany, from 1945-1955, have concentrated on the American influence as a military occupier, the development of German reconstruction and national identity, and memory of this period from the German perspective. Within the memory analyses, firsthand accounts have been analyzed to understand the perspectives of Germans living through the postwar period. Absent from this historiography is an account of American memories and firsthand perspectives of the occupation, particularly during the 1950-1955 period. This thesis employs oral histories of American veterans stationed in postwar Germany, American propaganda and popular cultural mediums during the early 1950s, and modern historiographical trends to provide an understanding of how Americans remember the German postwar decade. American veterans remembered this period, and their encounters with local Germans, as a positive experience. These positive memories were mediated by 1950s Cold War rhetoric and propaganda and were subsequently predicated upon the men's perspective as occupying soldiers. Their recollections align with American popular memory delineating the military occupation as ending in 1949 upon the creation of the Federal Republic of Germany, therefore overshadowing the 1950-1955 period of occupation. The ways in which Americans remember the postwar occupation in Germany, particularly from 1950-1955, inform broader memory and historical narrative trends of this era.
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Date Issued: 2015
Identifier: CFE0005732, ucf:50113
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005732

Title: DESIGN, FABRICATION AND TESTING OF A SHAPE MEMORY ALLOY BASED CRYOGENIC THERMAL CONDUCTION SWITCH.
Creator: Krishnan, Vinu Bala, Vaidyanathan, Raj, University of Central Florida
Abstract / Description: Shape memory alloys (SMAs) can recover large strains (e.g., up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a change in temperature and actuate by undergoing a shape change, associated with the temperature-induced phase transformation. The objective of...
Show moreShape memory alloys (SMAs) can recover large strains (e.g., up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a change in temperature and actuate by undergoing a shape change, associated with the temperature-induced phase transformation. The objective of this work is to develop an SMA based cryogenic thermal conduction switch for operation between dewars of liquid methane and liquid oxygen in a common bulk head arrangement for NASA. The design of the thermal conduction switch is based on a biased, two-way SMA actuator and utilizes a commercially available NiTi alloy as the SMA element to demonstrate the feasibility of this concept. This work describes the design from concept to implementation, addressing methodologies and issues encountered, including: a finite element based thermal analysis, various thermo-mechanical processes carried out on the NiTi SMA elements, and fabrication and testing of a prototype switch. Furthermore, recommendations for improvements and extension to NASA's requirements are presented. Such a switch has potential application in variable thermal sinks to other cryogenic tanks for liquefaction, densification, and zero boil-off systems for advanced spaceport applications. The SMA thermal conduction switch offers the following advantages over the currently used gas gap and liquid gap thermal switches in the cryogenic range: (i) integrates both sensor and actuator elements thereby reducing the overall complexity, (ii) exhibits superior thermal isolation in the open state, and (iii) possesses high heat transfer ratios between the open and closed states. This work was supported by a grant from NASA Kennedy Space Center (NAG10-323) with William U. Notardonato as Technical Officer.
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Date Issued: 2004
Identifier: CFE0000038, ucf:46136
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000038

Title: Automated Synthesis of Unconventional Computing Systems.
Creator: Hassen, Amad Ul, Jha, Sumit Kumar, Sundaram, Kalpathy, Fan, Deliang, Ewetz, Rickard, Rahman, Talat, University of Central Florida
Abstract / Description: Despite decades of advancements, modern computing systems which are based on the von Neumann architecture still carry its shortcomings. Moore's law, which had substantially masked the effects of the inherent memory-processor bottleneck of the von Neumann architecture, has slowed down due to transistor dimensions nearing atomic sizes. On the other hand, modern computational requirements, driven by machine learning, pattern recognition, artificial intelligence, data mining, and IoT, are growing...
Show moreDespite decades of advancements, modern computing systems which are based on the von Neumann architecture still carry its shortcomings. Moore's law, which had substantially masked the effects of the inherent memory-processor bottleneck of the von Neumann architecture, has slowed down due to transistor dimensions nearing atomic sizes. On the other hand, modern computational requirements, driven by machine learning, pattern recognition, artificial intelligence, data mining, and IoT, are growing at the fastest pace ever. By their inherent nature, these applications are particularly affected by communication-bottlenecks, because processing them requires a large number of simple operations involving data retrieval and storage. The need to address the problems associated with conventional computing systems at the fundamental level has given rise to several unconventional computing paradigms. In this dissertation, we have made advancements for automated syntheses of two types of unconventional computing paradigms: in-memory computing and stochastic computing. In-memory computing circumvents the problem of limited communication bandwidth by unifying processing and storage at the same physical locations. The advent of nanoelectronic devices in the last decade has made in-memory computing an energy-, area-, and cost-effective alternative to conventional computing. We have used Binary Decision Diagrams (BDDs) for in-memory computing on memristor crossbars. Specifically, we have used Free-BDDs, a special class of binary decision diagrams, for synthesizing crossbars for flow-based in-memory computing. Stochastic computing is a re-emerging discipline with several times smaller area/power requirements as compared to conventional computing systems. It is especially suited for fault-tolerant applications like image processing, artificial intelligence, pattern recognition, etc. We have proposed a decision procedures-based iterative algorithm to synthesize Linear Finite State Machines (LFSM) for stochastically computing non-linear functions such as polynomials, exponentials, and hyperbolic functions.
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Date Issued: 2019
Identifier: CFE0007648, ucf:52462
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007648

Title: DOMESTIC PARENT-CHILD INTERACTION PROBLEMS AND WORKING MEMORY: THE MEDIATING ROLE OF INATTENTIVE ADHD SYMPTOMS.
Creator: Mohan, Svetha, Rapport, Mark, University of Central Florida
Abstract / Description: The intent of this thesis is to explore the mediating effects of ADHD Inattentive symptoms on domestic parent-child interaction problems and working memory. Inattentive symptoms in children with ADHD are known to cause forgetfulness, slow processing speed, and negative parent-child interactions. Working memory deficits in phonological short term memory and the central executive are also well-established in children with ADHD. However, it is currently unknown to what extent inattentive...
Show moreThe intent of this thesis is to explore the mediating effects of ADHD Inattentive symptoms on domestic parent-child interaction problems and working memory. Inattentive symptoms in children with ADHD are known to cause forgetfulness, slow processing speed, and negative parent-child interactions. Working memory deficits in phonological short term memory and the central executive are also well-established in children with ADHD. However, it is currently unknown to what extent inattentive symptoms are responsible for home behavior problems in conjunction with phonological working memory deficits. The aims are tested using two validated, common clinical questionnaires: The Teacher Report Form and the Home Situations Questionnaire. Additionally, working memory and executive function are tested using a phonological letter-number sequencing task and a visuospatial dot-in-the-box task. Results show that inattentive symptoms mediate the relationship between working memory and parent-child interaction problems. Teacher reports of inattention affect the degree to which the child experiences behavior problems at home, and also affects the phonological working memory system implicated in this behavior. Future directions include using a more diverse sample, investigating a wider range of ADHD symptoms, investigating effects across multiple settings, and exploring possibilities of additional executive functioning mediators.
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Date Issued: 2017
Identifier: CFH2000161, ucf:45976
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000161

Title: POLITICIAL CONSERVATISM AND ITS EFFECTS ON MEMORY AND BASIC RECALL.
Creator: Caine, Simon, Smither, Janan, University of Central Florida
Abstract / Description: The purpose of this study was to investigate how conservatism affects a person's perception of everyday details. It is hypothesized that there will be a positive correlation between the participants' conservative ratings and the amount of details from the readings they recall that are also conservative. This will also mean that there will be a negative correlation between the participants scoring higher on the conservatism scale and the amount of liberal details they recall. A similar pattern...
Show moreThe purpose of this study was to investigate how conservatism affects a person's perception of everyday details. It is hypothesized that there will be a positive correlation between the participants' conservative ratings and the amount of details from the readings they recall that are also conservative. This will also mean that there will be a negative correlation between the participants scoring higher on the conservatism scale and the amount of liberal details they recall. A similar pattern is expected to be discovered pertaining to participants that identify as more liberal. How is this measured? The participants will be asked to rate the their political views on a scale of 1-6, 1 being extremely liberal, and 6 being extremely conservative. A transcript of a political debate will contain views that are both conservative and liberal. Each view will be backed up by details supporting each of a candidate's policies. The transcript will include minor grammatical errors including punctuation, spelling, and tenses, all of which the participant will be asked to correct. Following this will be a mathematical task which will include converting mixed numbers to improper fractions at the difficulty of a fifth grade level. A memory recall task will then be administered to the participants asking them to recall as many of the details from the debate as possible.
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Date Issued: 2011
Identifier: CFH0003773, ucf:44745
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0003773

Title: INDIVIDUAL DIFFERENCES IN EYEWITNESS TESTIMONY.
Creator: Cal, Noel A, Mouloua, Mustapha, University of Central Florida
Abstract / Description: Eyewitness testimony plays a crucial role in the justice system. Misidentification from eyewitnesses was reported in 70% of 300 DNA exonerations of wrongfully convicted individuals (Wixted et al., 2015). Similarly, many convicts can also be set free because of juror's faulty eyewitness recall during examination. Previous research indicated that females are more reliable in recall than men. However, these findings were not extensively examined with regards to time delay prior to the trial....
Show moreEyewitness testimony plays a crucial role in the justice system. Misidentification from eyewitnesses was reported in 70% of 300 DNA exonerations of wrongfully convicted individuals (Wixted et al., 2015). Similarly, many convicts can also be set free because of juror's faulty eyewitness recall during examination. Previous research indicated that females are more reliable in recall than men. However, these findings were not extensively examined with regards to time delay prior to the trial. Thus, it is important to systematically examine the various factors that influence eyewitness testimony. The present study was designed to empirically examine the effects of gender, interview technique, and time interval on eyewitness recall. It was hypothesized that female participants would outscore male participants in both facial and detail recall. It was also hypothesized that the cognitive interview would yield more accurate details about the crime in comparison to the standard interview. It was hypothesized that recall for participants would decay as the time interval increased. One hundred and four participants were randomly selected from a southeastern university to participate in the study. Ages of the participants ranged from 18-40 and consisted of fifty-two males and fifty-two females. They were required to complete a series of questionnaires consisting of demographics, mood measure, personality test, and standard/cognitive interviews. The results showed a significant effect between gender, interview technique, and time interval on detail recall. In addition, there was a significant main effect for interview type. There was a significant effect of gender and time interval on facial recall. It was found that extraversion significantly predicted detail recall as did agreeableness and neuroticism. The present findings further extend previous research examining the most effective interviewing techniques for eyewitness recall. It also indicated that females can accurately recall faces after a time delay in comparison to men. Furthermore, these results also clearly indicate that gender and time interval play a significant role in facial recall. Finally, the findings have practical implications for the jury selection system. For example, attorneys and judges might be inclined to choose women over men for specific cases where eyewitness details may be crucial for conviction. In addition, they may also use facial shots in order to enhance eyewitness recall. Personality measures can assist detectives to determine if a suspect is suitable for an interview. If at all possible, administering personality test for jurors may help in determining certain personality types are more prone to error.
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Date Issued: 2016
Identifier: CFH2000152, ucf:46033
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000152

Title: EXPLORING SUPPORTED CONVERSATION WITH FAMILIAL CAREGIVERS OF PERSONS WITH MEMORY IMPAIRMENT: A PILOT STUDY.
Creator: Willis, Arielle, Whiteside, Janet, University of Central Florida
Abstract / Description: Teaching conversational strategies has been effective for a wide array of clients with acquired neurologic disorders and their caregivers. Research indicates positive results for Supported Conversation in adults with Aphasia (SCA) secondary to stroke. Applying this method to work with caregivers of persons with memory impairment could prove to be a valid intervention tool. This investigation will examine the applicability of SCA with persons with memory impairment and their familial...
Show moreTeaching conversational strategies has been effective for a wide array of clients with acquired neurologic disorders and their caregivers. Research indicates positive results for Supported Conversation in adults with Aphasia (SCA) secondary to stroke. Applying this method to work with caregivers of persons with memory impairment could prove to be a valid intervention tool. This investigation will examine the applicability of SCA with persons with memory impairment and their familial caregivers. This pilot study is intended to create a conversation regarding SCA and its implementation with persons with memory impairment who still live in the community with their caregivers. Analysis between the pre-training and post-training scores showed a trend to wards significance for Time (F(1, 9) = 0.064), no significance for Measure (F(3, 9) = 0.558), and no significance for the interaction of Time*Measure (F(3, 9) = 0.276). The effect size for Time was 0.732, for Measure was 0.494 and for Time*Measure was 0.956.
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Date Issued: 2016
Identifier: CFH2000139, ucf:46044
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000139

Title: LOW TEMPERATURE NITIFE SHAPE MEMORY ALLOYS: ACTUATOR ENGINEERING AND INVESTIGATION OF DEFORMATION MECHANISMS USING IN SITU NEUTRON DIFFRACTION AT LOS ALAMOS NATIONAL LABORATORY.
Creator: Krishnan, Vinu, Vaidyanathan, Raj, University of Central Florida
Abstract / Description: Shape memory alloys are incorporated as actuator elements due to their inherent ability to sense a change in temperature and actuate against external loads by undergoing a shape change as a result of a temperature-induced phase transformation. The cubic so-called austenite to the trigonal so-called R-phase transformation in NiTiFe shape memory alloys offers a practical temperature range for actuator operation at low temperatures, as it exhibits a narrow temperature-hysteresis with a desirable...
Show moreShape memory alloys are incorporated as actuator elements due to their inherent ability to sense a change in temperature and actuate against external loads by undergoing a shape change as a result of a temperature-induced phase transformation. The cubic so-called austenite to the trigonal so-called R-phase transformation in NiTiFe shape memory alloys offers a practical temperature range for actuator operation at low temperatures, as it exhibits a narrow temperature-hysteresis with a desirable fatigue response. Overall, this work is an investigation of selected science and engineering aspects of low temperature NiTiFe shape memory alloys. The scientific study was performed using in situ neutron diffraction measurements at the newly developed low temperature loading capability on the Spectrometer for Materials Research at Temperature and Stress (SMARTS) at Los Alamos National Laboratory and encompasses three aspects of the behavior of Ni46.8Ti50Fe3.2 at 92 K (the lowest steady state temperature attainable with the capability). First, in order to study deformation mechanisms in the R-phase in NiTiFe, measurements were performed at a constant temperature of 92 K under external loading. Second, with the objective of examining NiTiFe in one-time, high-stroke, actuator applications (such as in safety valves), a NiTiFe sample was strained to approximately 5% (the R-phase was transformed to B19' phase in the process) at 92 K and subsequently heated to full strain recovery under a load. Third, with the objective of examining NiTiFe in cyclic, low-stroke, actuator applications (such as in cryogenic thermal switches), a NiTiFe sample was strained to 1% at 92 K and subsequently heated to full strain recovery under load. Neutron diffraction spectra were recorded at selected time and stress intervals during these experiments. The spectra were subsequently used to obtain quantitative information related to the phase-specific strain, texture and phase fraction evolution using the Rietveld technique. The mechanical characterization of NiTiFe alloys using the cryogenic capability at SMARTS provided considerable insight into the mechanisms of phase transformation and twinning at cryogenic temperatures. Both mechanisms contribute to shape memory and pseudoelasticity phenomena. Three phases (R, B19' and B33 phases) were found to coexist at 92 K in the unloaded condition (nominal holding stress of 8 MPa). For the first time the elastic modulus of R-phase was reported from neutron diffraction experiments. Furthermore, for the first time a base-centered orthorhombic (B33) martensitic phase was identified experimentally in a NiTi-based shape memory alloy. The orthorhombic B33 phase has been theoretically predicted in NiTi from density function theory (DFT) calculations but hitherto has never been observed experimentally. The orthorhombic B33 phase was observed while observing shifting of a peak (identified to be B33) between the R and B19' peaks in the diffraction spectra collected during loading. Given the existing ambiguity in the published literature as to whether the trigonal R-phase belongs to the P3 or P space groups, Rietveld analyses were separately carried out incorporating the symmetries associated with both space groups and the impact of this choice evaluated. The constrained recovery of the B19' phase to the R-phase recorded approximately 4% strain recovery between 150 K and 170 K, with half of that recovery occurring between 160 K and 162 K. Additionally, the aforementioned research methodology developed for Ni46.8Ti50Fe3.2 shape memory alloys was applied to experiments performed on a new high temperature Ni29.5Ti50.5Pd20 shape memory alloys. The engineering aspect focused on the development of (i) a NiTiFe based thermal conduction switch that minimized the heat gradient across the shape memory actuator element, (ii) a NiTiFe based thermal conduction switch that incorporated the actuator element in the form of helical springs, and (iii) a NiTi based release mechanism. Patents are being filed for all the three shape memory actuators developed as a part of this work. This work was supported by grants from SRI, NASA (NAG3-2751) and NSF (CAREER DMR-0239512) to UCF. Additionally, this work benefited from the use of the Lujan Center at the Los Alamos Neutron Science Center, funded by the United States Department of Energy, Office of Basic Energy Sciences, under Contract No. W-7405-ENG-36.
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Date Issued: 2007
Identifier: CFE0001934, ucf:47437
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001934

Title: HYPERACTIVITY IN BOYS WITH ATTENTION-DEFICIT/HYPERACTIVITY DISORDER: A UBIQUITOUS CORE SYMPTOM OR MANIFESTATION OF WORKING MEMORY DEFICITS?.
Creator: Bolden, Jennifer, Rapport, Mark, University of Central Florida
Abstract / Description: Hyperactivity is currently considered a core and ubiquitous feature of attention-deficit/hyperactivity disorder (ADHD); however, an alternative model challenges this premise and hypothesizes a functional relationship between working memory (WM) and activity level. The current study investigated whether children's activity level is functionally related to WM demands associated with the domain-general central executive and subsidiary storage/rehearsal components using tasks based on...
Show moreHyperactivity is currently considered a core and ubiquitous feature of attention-deficit/hyperactivity disorder (ADHD); however, an alternative model challenges this premise and hypothesizes a functional relationship between working memory (WM) and activity level. The current study investigated whether children's activity level is functionally related to WM demands associated with the domain-general central executive and subsidiary storage/rehearsal components using tasks based on Baddeley's (2007) WM model. Activity level was objectively measured 16 times per second using wrist- and ankle-worn actigraphs while 23 boys between 8 and 12 years of age completed control tasks and visuospatial/phonological WM tasks of increasing memory demands. All children exhibited significantly higher activity rates under all WM relative to control conditions, and children with ADHD (n=12) moved significantly more than typically developing children (n=11) under all conditions. Activity level in all children was associated with central executive but not storage/rehearsal functioning, and higher activity rates exhibited by children with ADHD under control conditions were fully attenuated by removing variance directly related to central executive processes.
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Date Issued: 2008
Identifier: CFE0002455, ucf:47702
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002455

Title: BLOODLINES.
Creator: toner, Pamela, Bartkevicius, Jocelyn, University of Central Florida
Abstract / Description: "Bloodlines" is a collection of personal essays that focus on the process of remembering, imagining, and reflecting on the past through the lens of a perpetually shifting present. They consider situations ranging from mental and physical illnesses, from cancer to alcohol addiction, to career changes, to the often dysfunctional and displaced family ties that distance and adulthood have not severed. In "Searching," I write the narrative of the ongoing search for my birthmother, and how the...
Show more"Bloodlines" is a collection of personal essays that focus on the process of remembering, imagining, and reflecting on the past through the lens of a perpetually shifting present. They consider situations ranging from mental and physical illnesses, from cancer to alcohol addiction, to career changes, to the often dysfunctional and displaced family ties that distance and adulthood have not severed. In "Searching," I write the narrative of the ongoing search for my birthmother, and how the search complicates the relationship with my adoptive mother, who always feared she'd lose me. Similarly, "Of Flesh and Blood" recounts and negotiates how hereditary and environmental factors have shaped my identity. Loss and betrayal are weaved throughout "Flight Patterns" when I trace the links between relationships among my family and my pets. In "Signs and Stars" and "Seeing Stars," I search for ways of dealing with my cancer diagnosis and alcoholism, weaving through my past as I fight for recovery. By exploring the subjective nature of memory and circumstance through sensory, expositional, structural, and even written documentation, I have attempted to capture what is, for me, the tenuous hold on intertwined moments in time by creating a palimpsest of perspectives.
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Date Issued: 2006
Identifier: CFE0001053, ucf:46819
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001053

Title: PSYCHOMETRIC PROPERTIES OF A WORKING MEMORY SPAN TASK.
Creator: Alzate Vanegas, Juan M, Mouloua, Mustapha, University of Central Florida
Abstract / Description: The intent of this thesis is to examine the psychometric properties of a complex span task (CST) developed to measure working memory capacity (WMC) using measurements obtained from a sample of 68 undergraduate students at the University of Central Florida. The Grocery List Task (GLT) promises several design improvements over traditional CSTs in a prior study about individual differences in WMC and distraction effects on driving performance, and it offers potential benefits for studying WMC as...
Show moreThe intent of this thesis is to examine the psychometric properties of a complex span task (CST) developed to measure working memory capacity (WMC) using measurements obtained from a sample of 68 undergraduate students at the University of Central Florida. The Grocery List Task (GLT) promises several design improvements over traditional CSTs in a prior study about individual differences in WMC and distraction effects on driving performance, and it offers potential benefits for studying WMC as well as the serial-position effect. Currently, the working memory system is composed of domain-general memorial storage processes and information-processing, which involves the use of executive functions. Prior research has found WMC to be associated with attentional measures (i.e., executive attention) and the updating function, and unrelated to the shifting function. The present study replicates these relationships to other latent variables in measures obtained from the GLT as convergent and discriminant evidence of validity. In addition, GLT measures correlate strongly with established measures of WMC. Task reliability is assessed by estimates of internal consistency, pairwise comparisons with a cross-validation sample, and an analysis of demographic effects on task measurements.
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Date Issued: 2018
Identifier: CFH2000358, ucf:45857
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000358

Title: THE EFFECT OF COLOR ON WORKING MEMORY PERFORMANCE.
Creator: Galvez, Michelle, Neider, Mark, University of Central Florida
Abstract / Description: This paper explores the effect of color on working memory performance. Interest in Baker-Miller pink surged with the finding by Schauss (1979) that it reduced aggression in aggravated detainees. However, research behind Baker-Miller pink has been influenced by biases and methodological errors. Its effects are likely overstated. Red and blue have also been studied for their effects on creativity, approach-avoidance conflict, detail-orientation, and most importantly, stress. Further research...
Show moreThis paper explores the effect of color on working memory performance. Interest in Baker-Miller pink surged with the finding by Schauss (1979) that it reduced aggression in aggravated detainees. However, research behind Baker-Miller pink has been influenced by biases and methodological errors. Its effects are likely overstated. Red and blue have also been studied for their effects on creativity, approach-avoidance conflict, detail-orientation, and most importantly, stress. Further research has been conducted on the effects of relaxation on cognition, with the conclusion that increased relaxation leads to improvements in working memory performance. This paper tests the effect of color on working memory performance. Accuracy on the n-back was compared across 4 colors�pink, red, blue, and black. No significant differences in accuracy were found in any of the color conditions, though the main effect of load was significant. Future research can increase the sample size and utilize a cognitive task that is inherently stressful.
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Date Issued: 2015
Identifier: CFH0004859, ucf:45484
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004859

Title: EXPLORING TACIT KNOWLEDGE IN ORGANIZATIONS.
Creator: Plazas, Andrea, Salas , Eduardo, University of Central Florida
Abstract / Description: There has been a growing prevalent interest to explore the role of knowledge in organizations. Bhardwaj and Monin (2006) identified the knowledge of individuals' as a valuable source of competitive advantage. An organizations well-rounded institutional memory- the organizations collective experiences (Rothwell & Poduch, 2004), fosters competitive advantage. There is a prevailing need to scrutinize the role of tacit knowledge in organizations and how it's hard to articulate nature makes it...
Show moreThere has been a growing prevalent interest to explore the role of knowledge in organizations. Bhardwaj and Monin (2006) identified the knowledge of individuals' as a valuable source of competitive advantage. An organizations well-rounded institutional memory- the organizations collective experiences (Rothwell & Poduch, 2004), fosters competitive advantage. There is a prevailing need to scrutinize the role of tacit knowledge in organizations and how it's hard to articulate nature makes it difficult for organizations to acquire and preserve institutional memory value. The aim of this review is to illustrate that tacit knowledge contributes significantly to the institutional memory value, expansion and preservation. In an effort to simplify this relationship between tacit knowledge and institutional memory, a comprehensive literature search was performed. I first discuss the role of knowledge in organizations and use the literature on tacit knowledge as a guide to explain the importance of its elicitation for institutional memory expansion and preservation. I then propose: (1) the use of tacit knowledge elicitation as a mediator, and (2) recommend training and a learning organization environment as moderators, for the contribution to take place. Finally, I suggest that organizations: (a) Elicit tacit knowledge sharing at their human capital development training programs (b) develop and implement this trainings at managerial levels, and (c) a "know-why" method to elicit and capture tacit knowledge in a reference guide, to consequently add value to the institutional memory, I conclude with a discussion of implications and limitations for the proposed perspective, and provide suggestions for future research.
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Date Issued: 2013
Identifier: CFH0004492, ucf:45062
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004492

Title: To The Memory Of Brave Men: The Imperial War Graves Commission And India's Missing Soldiers Of The First World War.
Creator: Sims, Roger, Gannon, Barbara, Lester, Connie, Zhang, Hong, University of Central Florida
Abstract / Description: This thesis examines the commemoration of Indian soldiers who died during the First World War by the Imperial War Graves Commission, Britain's official government body overseeing all imperial commemoration efforts. For the soldiers of the Indian Army their war experience was split between the Western Front in Europe and Mesopotamia in modern-day Iraq. They were also far more ethnically, religiously, and lingually diverse than their British and Dominion counterparts. In order to examine how...
Show moreThis thesis examines the commemoration of Indian soldiers who died during the First World War by the Imperial War Graves Commission, Britain's official government body overseeing all imperial commemoration efforts. For the soldiers of the Indian Army their war experience was split between the Western Front in Europe and Mesopotamia in modern-day Iraq. They were also far more ethnically, religiously, and lingually diverse than their British and Dominion counterparts. In order to examine how geography, religion, and the imperial relationship affected Britain's commemoration of India's war dead, this study uses the Commission's own records to recreate how the IWGC created its policies regarding Indian soldiers. The result shows that while the Commission made nearly every effort to respect India's war dead, the complexity of their backgrounds hampered these efforts and forced compromises to be made. The geography of the war also forced a clear definition between the memories of Indian soldiers who died in Europe and those who fell in Mesopotamia.
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Date Issued: 2018
Identifier: CFE0007098, ucf:51938
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007098

Title: Working Memory Capacity and Executive Attention as Predictors of Distracted Driving.
Creator: Louie, Jennifer, Mouloua, Mustapha, Szalma, James, Smither, Janan, Matthews, Gerald, University of Central Florida
Abstract / Description: The present study empirically examined the effects of working memory capacity (WMC) and executive attention on distracted driving. Study 1 examined whether a Grocery List Task (GLT) distractor would load onto WMC. Forty-three participants completed a series of WMC tasks followed by the GLT. They then completed two driving trials: driving without the GLT and driving while completing the GLT. It was hypothesized that WMC would positively correlate with GLT performance. A bivariate correlation...
Show moreThe present study empirically examined the effects of working memory capacity (WMC) and executive attention on distracted driving. Study 1 examined whether a Grocery List Task (GLT) distractor would load onto WMC. Forty-three participants completed a series of WMC tasks followed by the GLT. They then completed two driving trials: driving without the GLT and driving while completing the GLT. It was hypothesized that WMC would positively correlate with GLT performance. A bivariate correlation indicated that WMC was positively associated with performance on the GLT. Study 2 tested a series of distractor tasks (GLT, Tone Monitoring, and Stop Signal) to examine whether these three distractor tasks were also related to WMC, and if each of the distractor tasks would result in poor driving performance. Eighty-four participants were randomly assigned to the distractor conditions. Results indicated that GLT was related to WMC, but Tone Monitoring was not related to WMC. Also, engaging in each of the three distractor tasks led to significantly poorer driving performance. Study 3 evaluated whether rainy or clear weather conditions would affect the relationship between WMC and distracted driving using the same three distractor tasks (GLT, Tone Monitoring, and Stop Signal) as used in Study 2. Ninety-six participants were randomly assigned to the distractor conditions. Results showed that engaging in GLT while driving led to slower braking response times compared to not engaging in GLT driving while driving. Furthermore, WMC moderated the degree to which distraction impaired performance. The present findings clearly indicate that all three distractor tasks had a deleterious effect on driving performance. Furthermore, this effect of distraction on driving depends on many factors, including the type of distraction, the driving performance measure, and the individual's cognitive capabilities. Both theoretical and practical implications are discussed and directions for future research are presented.
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Date Issued: 2018
Identifier: CFE0007042, ucf:51981
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007042

Title: Approximate In-memory computing on RERAMs.
Creator: Khokhar, Salman Anwar, Heinrich, Mark, Leavens, Gary, Yuksel, Murat, Bagci, Ulas, Rahman, Talat, University of Central Florida
Abstract / Description: Computing systems have seen tremendous growth over the past few decades in their capabilities, efficiency, and deployment use cases. This growth has been driven by progress in lithography techniques, improvement in synthesis tools, architectures and power management. However, there is a growing disparity between computing power and the demands on modern computing systems. The standard Von-Neuman architecture has separate data storage and data processing locations. Therefore, it suffers from a...
Show moreComputing systems have seen tremendous growth over the past few decades in their capabilities, efficiency, and deployment use cases. This growth has been driven by progress in lithography techniques, improvement in synthesis tools, architectures and power management. However, there is a growing disparity between computing power and the demands on modern computing systems. The standard Von-Neuman architecture has separate data storage and data processing locations. Therefore, it suffers from a memory-processor communication bottleneck, which is commonly referredto as the 'memory wall'. The relatively slower progress in memory technology compared with processing units has continued to exacerbate the memory wall problem. As feature sizes in the CMOSlogic family reduce further, quantum tunneling effects are becoming more prominent. Simultaneously, chip transistor density is already so high that all transistors cannot be powered up at the same time without violating temperature constraints, a phenomenon characterized as dark-silicon. Coupled with this, there is also an increase in leakage currents with smaller feature sizes, resultingin a breakdown of 'Dennard's' scaling. All these challenges cannot be met without fundamental changes in current computing paradigms. One viable solution is in-memory computing, wherecomputing and storage are performed alongside each other. A number of emerging memory fabrics such as ReRAMS, STT-RAMs, and PCM RAMs are capable of performing logic in-memory.ReRAMs possess high storage density, have extremely low power consumption and a low cost of fabrication. These advantages are due to the simple nature of its basic constituting elements whichallow nano-scale fabrication. We use flow-based computing on ReRAM crossbars for computing that exploits natural sneak paths in those crossbars.Another concurrent development in computing is the maturation of domains that are error resilient while being highly data and power intensive. These include machine learning, pattern recognition,computer vision, image processing, and networking, etc. This shift in the nature of computing workloads has given weight to the idea of (")approximate computing("), in which device efficiency is improved by sacrificing tolerable amounts of accuracy in computation. We present a mathematically rigorous foundation for the synthesis of approximate logic and its mapping to ReRAM crossbars using search based and graphical methods.
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Date Issued: 2019
Identifier: CFE0007827, ucf:52817
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007827

Title: Printable Carbon Nanotube Based Multifunctional Nanocomposites for Strain Sensing and Self-heating.
Creator: Wang, Xin, Gou, Jihua, Challapalli, Suryanarayana, Xu, Yunjun, University of Central Florida
Abstract / Description: The unique properties of carbon nanotubes (CNTs) represent a potential for developing a piezo-resistive strain sensor and a resistive heating sheet with a smart structure. Conventional fabrication techniques of CNT based nanocomposites such as molding, casting or spray coating lack the ability to control the geometry and properties of fabricated composites. In order to meet the various requirements of strain sensing or self-heating applications, nanocomposites with complex geometry and...
Show moreThe unique properties of carbon nanotubes (CNTs) represent a potential for developing a piezo-resistive strain sensor and a resistive heating sheet with a smart structure. Conventional fabrication techniques of CNT based nanocomposites such as molding, casting or spray coating lack the ability to control the geometry and properties of fabricated composites. In order to meet the various requirements of strain sensing or self-heating applications, nanocomposites with complex geometry and controllable properties are in high demand. Digital printing technique is able to fabricate CNT films with precisely controlled geometry with the help of computer aided design, and their properties could also be controlled by adjusting the printing parameters. The objective of this study is to investigate the printing-structure-property relationship of CNT based multifunctional nanocomposites fabricated by digitally controlled spray deposition process for strain sensing and self-heating. A spray deposition modeling (SDM) printer that uses a 12-array inkjet nozzle attached to an x-y plotter was developed for the fabrication of CNT layers. Most of previously-reported CNT based nanocomposite strain sensors only have limited stretchability and sensitivity for measuring diverse human motions. Additionally, strain sensors fabricated by traditional techniques are only capable of measuring strain in a single direction, but for monitoring human motion with complicated strain condition, strain sensors that can measure strain from multi-direction are favorable. In this dissertation, highly stretchable (in excess of 45% strain) and sensitive (gauge factor of 35.75) strain sensors with tunable strain gauge factors were fabricated by incorporating CNT layers into polymer substrate using SDM printing technique. The cyclic loading-unloading test results revealed that the composite strain sensors exhibited excellent long-term durability. Due to the flexibility of the printing technique, rosette-typed sensors were fabricated to monitor complicated human motions. These superior sensing capabilities of the fabricated nanocomposites offer potential applications in wearable strain sensors. Resistive heating properties of CNT based nanocomposites were also investigated. The electrically resistive heating of these composites can be a desirable stimulus to activate the shape memory effect of polymer matrix. CNT based nanocomposites fabricated by traditional techniques showed a slow heating rate and same shape recovery ratio at different locations in nanocomposites. However, from the practical applications like smart skin or smart tooling perspective, programmable shape recovery ratio at specified locations are desirable. In this dissertation, the CNT based nanocomposites with a fast heating rate and controllable maximum surface temperature were fabricated using SDM technique. The study on the shape memory effect of nanocomposites showed that their shape recoverability was approximately 100% taking 30s under a low voltage of 40V. It is worth noting that through programming the number of printed CNT layers at different locations, the shape recovery rate could be controlled and localized actuation with the desired recovery ratio was achieved. The high efficiency of heating coupling with wide adjustability of surface temperature and shape recovery ratio at specified locations make the fabricated nanocomposites a promising candidate for electrical actuation applications.
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Date Issued: 2017
Identifier: CFE0006819, ucf:52892
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006819

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